Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada693274c9bcd75…

MALICIOUS

PDF

82.2 KB Created: 2021-10-05 03:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 40eba16f5e0c45c63dcd5776cf7839a2 SHA-1: 8a71ccab83e089997ea6b152d1239c0f51016f52 SHA-256: ada693274c9bcd75378f14442f090bad4dbd8e2a72f262e66bc139b8db2cf682
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The sample's primary function appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=cou+to+ord PDF link annotation
    • http://4darchitecture.org/img/all/voxisegesapudemojemoladiv.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/zuxexewaweweradufanib.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137943a3d11e---vuvapitiwiwovapiwuv.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/zaxupawenewegogoseru.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/lomegulubunidonaze.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631908310.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/wovuzab.pdfIn PDF document text
    • http://demkapi.com/resimler/files/gusopot.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/pavajef.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/26257517725.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/26590154691.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumelitufaxiwujik.pdfIn PDF document text
    • https://yuktogel.com/contents/files/todusukukugozu.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/wilirotidebegobumizuret.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/furep.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/84403156314.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/52660439032.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/bejokabewujilazubili.pdfIn PDF document text
    • http://melabo.com/upload/files/pizebaxijubinam.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/pujovo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/58466633682.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/vujuluwogegezusixekowide.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/59430155127.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/89499069504.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 20316 bytes
SHA-256: 2b395bb0a66a2e1833c993045b7fd6d737843d1bf3cf3c3f507dfdcd9927c468
font_01_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 9668 bytes
SHA-256: a534506879f73b43ec47cbba8591156137268b2fc56bfcecb37616123f681406

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